[xmlsec] exc c14n w/o comments bug

[Tomas Sieger]

Hi,
  I found another "mutation" of the bug I already reported several weeks 
ago: multiple namespace declaration in the output of the exclusive c14n 
w/o comments.

This time, the bug is really serious. Even libxml2 can't parse its own 
output :-))).

You can reproduce the bug using the attached files.

Run:

   ./testC14N --exc-without-comments b.xml b.xpath

I can see this output:

<wn1:ticket
xmlns:i="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:i="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:wn0="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd" 
xmlns:wn1="http://xmlsoap.org/Ping" wn0:Id="Id-Ticket1" i:nil="true" 
i:type="wn1:ticketType"></wn1:ticket>

Note the "i" namespace is declared for two times!

regards,
  Tomas
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<XPath xmlns:wn1="http://xmlsoap.org/Ping">
(//. | //@* | //namespace::*)[ancestor-or-self::wn1:ticket]
</XPath>